Siemens 3RH1921-1HA13 Auxiliary Contact Block

Product Description

The SIEMENS 3RH1921-1HA13 is an auxiliary contact block designed to expand the switching capability of compatible contactors and relay assemblies. This accessory module mounts directly to the base contactor and provides additional contact positions for control circuit signaling, interlocking, and status feedback functions. At 0.139 pounds and compact dimensions of 2.008 inches by 1.772 inches by 2.520 inches, the unit fits into tight panel spaces without requiring additional rail space. Licensed electricians and industrial control technicians install this type of component during panel builds, motor control center assemblies, and equipment retrofit projects.

Auxiliary contact blocks of this type are used in commercial and industrial electrical installations where the main contactor's built-in contacts are insufficient for the control scheme. Common applications include motor starters, HVAC equipment control panels, pump control circuits, and automated machinery. The block provides discrete signal contacts that feed PLCs, relay logic, or indicator circuits alongside the primary load-switching function of the base contactor.

Key Features

• Compact form factor at 2.008 x 1.772 x 2.520 inches for space-constrained enclosures
• Lightweight construction at 0.139 pounds
• Snap-on mounting style for direct attachment to compatible Siemens contactor bodies
• Provides supplemental contacts for control circuit interlocking and status signaling
• Sold individually as a single unit per pack

Compatibility

Designed as an OEM-style auxiliary contact block for use with compatible Siemens contactor and relay platforms. Consult the Siemens product documentation for confirmed base contactor fitment before installation.

Installation Notes

Installation should be performed by a licensed electrician in accordance with NEC requirements and local jurisdiction codes. De-energize and lock out the panel or motor control center before attaching or removing any contact block. Verify that the auxiliary block orientation and contact arrangement match the control schematic before restoring power. Do not force the snap-on mounting clip, as misalignment can damage the contact bridge inside the block.

Technical Specifications

• Dimensions (L x W x H): 2.008 inches x 1.772 inches x 2.520 inches
• Weight: 0.139 pounds
• Quantity per Pack: 1
• UPC: 75455475828

Standard Information

• Brand: SIEMENS
• Manufacturer Part Number: 3RH1921-1HA13